2 sentences

1. 他从不忘记别人给予他的恩惠。

   tā cóng bù wàng​jì bié​ren jǐ​yǔ tā de ēn​huì.

   He never forgets the favors others have done for him.

   Source: Dong Chinese Dictionary

2. 既然受了人家的恩惠，我也该答一份礼。

   jì​rán shòu le rén​jia de ēn​huì, wǒ yě gāi dá yī fèn lǐ.

   Since I've received a favor from them, I should return it with a gift.

   Source: Dong Chinese Dictionary